Improved mechanical properties and high temperature oxidation resistance for SiC f /SiC composites by introducing Ti 3 SiC 2

Abstract

SiC f /SiC-Ti 3 SiC 2 composites with different Ti 3 SiC 2 contents were prepared by slurry impregnation and in-situ reaction in this study. Microstructure analysis showed that the matrix of the coposites was mainly composed of Ti 3 SiC 2 , SiC, TiSi 2 and little amount of residual Si and C. The composites achieved the highest mechanical performance when the Ti 3 SiC 2 content was the highest. The high-temperature oxidation results indicated that even after 100 h of oxidation at 1300°C, the bending strength of the composite material can still maintain 83% of its initial strength compared to other composites. This may be due to the formation of SiO 2 and TiO 2 oxide layers by partial oxidation of Ti 3 SiC 2 in the matrix, which will protect the composite material from further oxidation.